Code clean up

src/Microsoft.AspNetCore.Mvc.Abstractions/ApiExplorer/ApiRequestFormat.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Mvc.Formatters;
-using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNetCore.Mvc.ApiExplorer
 {

src/Microsoft.AspNetCore.Mvc.Abstractions/Formatters/FormatterCollection.cs

@@ -16,7 +16,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
         /// Initializes a new instance of the <see cref="FormatterCollection{TFormatter}"/> class that is empty.
         /// </summary>
         public FormatterCollection()
-            : base()
         {
         }
 

src/Microsoft.AspNetCore.Mvc.Abstractions/ModelBinding/IValueProvider.cs

@@ -1,8 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System.Threading.Tasks;
-
 namespace Microsoft.AspNetCore.Mvc.ModelBinding
 {
     /// <summary>

src/Microsoft.AspNetCore.Mvc.Abstractions/ModelBinding/ModelBindingResult.cs

@@ -93,7 +93,7 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding
             }
             else
             {
-                return $"Failed";
+                return "Failed";
             }
         }
 

src/Microsoft.AspNetCore.Mvc.Abstractions/ModelBinding/ModelMetadata.cs

@@ -419,7 +419,7 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return base.Equals(obj as ModelMetadata);
+            return Equals(obj as ModelMetadata);
         }
 
         /// <inheritdoc />

src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Abstractions;
@@ -118,7 +117,7 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
 
             var runtimeReturnType = GetRuntimeReturnType(declaredReturnType);
 
-            var apiResponseTypes = GetApiResponseTypes(action, responseMetadataAttributes, runtimeReturnType);
+            var apiResponseTypes = GetApiResponseTypes(responseMetadataAttributes, runtimeReturnType);
             foreach (var apiResponseType in apiResponseTypes)
             {
                 apiDescription.SupportedResponseTypes.Add(apiResponseType);
@@ -128,7 +127,7 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
             // could end up with duplicate data.
             foreach (var parameter in apiDescription.ParameterDescriptions.Where(p => p.Source == BindingSource.Body))
             {
-                var requestFormats = GetRequestFormats(action, requestMetadataAttributes, parameter.Type);
+                var requestFormats = GetRequestFormats(requestMetadataAttributes, parameter.Type);
                 foreach (var format in requestFormats)
                 {
                     apiDescription.SupportedRequestFormats.Add(format);
@@ -302,7 +301,6 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
         }
 
         private IReadOnlyList<ApiRequestFormat> GetRequestFormats(
-            ControllerActionDescriptor action,
             IApiRequestMetadataProvider[] requestMetadataAttributes,
             Type type)
         {
@@ -352,7 +350,6 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
         }
 
         private IReadOnlyList<ApiResponseType> GetApiResponseTypes(
-            ControllerActionDescriptor action,
             IApiResponseMetadataProvider[] responseMetadataAttributes,
             Type type)
         {
@@ -579,7 +576,7 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
                 Context = context;
                 Parameter = parameter;
 
-                Visited = new HashSet<PropertyKey>();
+                Visited = new HashSet<PropertyKey>(new PropertyKeyEqualityComparer());
             }
 
             public ApiParameterContext Context { get; }
@@ -736,7 +733,11 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
 
                 public int GetHashCode(PropertyKey obj)
                 {
-                    return obj.ContainerType.GetHashCode() ^ obj.PropertyName.GetHashCode() ^ obj.Source.GetHashCode();
+                    var hashCodeCombiner = HashCodeCombiner.Start();
+                    hashCodeCombiner.Add(obj.ContainerType);
+                    hashCodeCombiner.Add(obj.PropertyName);
+                    hashCodeCombiner.Add(obj.Source);
+                    return hashCodeCombiner.CombinedHash;
                 }
             }
         }

src/Microsoft.AspNetCore.Mvc.ApiExplorer/Microsoft.AspNetCore.Mvc.ApiExplorer.csproj

@@ -14,6 +14,7 @@
     <ProjectReference Include="..\Microsoft.AspNetCore.Mvc.Core\Microsoft.AspNetCore.Mvc.Core.csproj" />
 
     <PackageReference Include="Microsoft.Extensions.ClosedGenericMatcher.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.Extensions.HashCodeCombiner.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
     <PackageReference Include="Microsoft.Extensions.PropertyHelper.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
   </ItemGroup>
 

src/Microsoft.AspNetCore.Mvc.Core/AcceptVerbsAttribute.cs

@@ -22,7 +22,7 @@ namespace Microsoft.AspNetCore.Mvc
         /// </summary>
         /// <param name="method">The HTTP method the action supports.</param>
         public AcceptVerbsAttribute(string method)
-            : this(new string[] { method })
+            : this(new [] { method })
         {
             if (method == null)
             {

src/Microsoft.AspNetCore.Mvc.Core/ActionResult.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc.Internal;
 
 namespace Microsoft.AspNetCore.Mvc
 {

src/Microsoft.AspNetCore.Mvc.Core/ApiExplorer/IApiRequestFormatMetadataProvider.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNetCore.Mvc.ApiExplorer
 {

src/Microsoft.AspNetCore.Mvc.Core/ApplicationModels/ControllerModel.cs

@@ -7,7 +7,6 @@ using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
 using Microsoft.AspNetCore.Mvc.Filters;
-using Microsoft.AspNetCore.Mvc.Routing;
 using Microsoft.AspNetCore.Routing;
 
 namespace Microsoft.AspNetCore.Mvc.ApplicationModels

src/Microsoft.AspNetCore.Mvc.Core/Authorization/AuthorizeFilter.cs

@@ -5,16 +5,13 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using System.Security.Claims;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Authorization.Policy;
 using Microsoft.AspNetCore.Mvc.Core;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Internal;
 
 namespace Microsoft.AspNetCore.Mvc.Authorization
 {

src/Microsoft.AspNetCore.Mvc.Core/ControllerBase.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq.Expressions;
 using System.Security.Claims;

src/Microsoft.AspNetCore.Mvc.Core/ControllerContext.cs

@@ -23,7 +23,6 @@ namespace Microsoft.AspNetCore.Mvc
         /// The default constructor is provided for unit test purposes only.
         /// </remarks>
         public ControllerContext()
-            : base()
         {
         }
 

src/Microsoft.AspNetCore.Mvc.Core/Controllers/ControllerActivatorProvider.cs

@@ -13,7 +13,6 @@ namespace Microsoft.AspNetCore.Mvc.Controllers
     /// </summary>
     public class ControllerActivatorProvider : IControllerActivatorProvider
     {
-        private static readonly Func<Type, ObjectFactory> _createFactory = (type) => ActivatorUtilities.CreateFactory(type, Type.EmptyTypes);
         private static readonly Action<ControllerContext, object> _dispose = Dispose;
         private readonly Func<ControllerContext, object> _controllerActivatorCreate;
         private readonly Action<ControllerContext, object> _controllerActivatorRelease;

src/Microsoft.AspNetCore.Mvc.Core/Controllers/DefaultControllerActivator.cs

@@ -2,9 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Reflection;
 using Microsoft.AspNetCore.Mvc.Core;
-using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.AspNetCore.Mvc.Internal;
 
 namespace Microsoft.AspNetCore.Mvc.Controllers

src/Microsoft.AspNetCore.Mvc.Core/Controllers/IControllerActivator.cs

@@ -1,8 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-
 namespace Microsoft.AspNetCore.Mvc.Controllers
 {
     /// <summary>

src/Microsoft.AspNetCore.Mvc.Core/DependencyInjection/MvcCoreMvcBuilderExtensions.cs

@@ -37,7 +37,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 throw new ArgumentNullException(nameof(setupAction));
             }
 
-            builder.Services.Configure<MvcOptions>(setupAction);
+            builder.Services.Configure(setupAction);
             return builder;
         }
 

src/Microsoft.AspNetCore.Mvc.Core/DependencyInjection/MvcCoreMvcCoreBuilderExtensions.cs

@@ -37,7 +37,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 throw new ArgumentNullException(nameof(setupAction));
             }
 
-            builder.Services.Configure<MvcOptions>(setupAction);
+            builder.Services.Configure(setupAction);
             return builder;
         }
 

src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.ObjectModel;
-using System.Reflection;
 using Microsoft.AspNetCore.Mvc.Core;
 
 namespace Microsoft.AspNetCore.Mvc.Filters

src/Microsoft.AspNetCore.Mvc.Core/Formatters/FormatterMappings.cs

@@ -77,8 +77,7 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
 
             format = RemovePeriodIfPresent(format);
 
-            string value = null;
-            _map.TryGetValue(format, out value);
+            _map.TryGetValue(format, out var value);
 
             return value;
         }

src/Microsoft.AspNetCore.Mvc.Core/Formatters/MediaType.cs

@@ -684,9 +684,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
 
         private struct MediaTypeParameter : IEquatable<MediaTypeParameter>
         {
-            public static readonly StringSegment Type = new StringSegment("type");
-            public static readonly StringSegment Subtype = new StringSegment("subtype");
-
             public MediaTypeParameter(StringSegment name, StringSegment value)
             {
                 Name = name;

src/Microsoft.AspNetCore.Mvc.Core/Formatters/MediaTypeCollection.cs

@@ -12,13 +12,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
     /// </summary>
     public class MediaTypeCollection : Collection<string>
     {
-        /// <summary>
-        /// Initializes a new instance of <see cref="MediaTypeCollection"/>.
-        /// </summary>
-        public MediaTypeCollection()
-        {
-        }
-
         /// <summary>
         /// Adds an object to the end of the <see cref="MediaTypeCollection"/>. 
         /// </summary>

src/Microsoft.AspNetCore.Mvc.Core/Formatters/TextInputFormatter.cs

@@ -42,7 +42,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
                 throw new ArgumentNullException(nameof(context));
             }
 
-            var request = context.HttpContext.Request;
             var selectedEncoding = SelectCharacterEncoding(context);
             if (selectedEncoding == null)
             {

src/Microsoft.AspNetCore.Mvc.Core/Formatters/TextOutputFormatter.cs

@@ -207,7 +207,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
         private IList<StringWithQualityHeaderValue> Sort(IList<StringWithQualityHeaderValue> values)
         {
             var sortNeeded = false;
-            var count = 0;
 
             for (var i = 0; i < values.Count; i++)
             {
@@ -218,13 +217,8 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
                 }
                 else if (value.Quality != null)
                 {
-                    count++;
                     sortNeeded = true;
                 }
-                else
-                {
-                    count++;
-                }
             }
 
             if (!sortNeeded)

src/Microsoft.AspNetCore.Mvc.Core/HttpDeleteAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpDeleteAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "DELETE" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "DELETE" };
 
         /// <summary>
         /// Creates a new <see cref="HttpDeleteAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpGetAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpGetAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "GET" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "GET" };
 
         /// <summary>
         /// Creates a new <see cref="HttpGetAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpHeadAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpHeadAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "HEAD" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "HEAD" };
 
         /// <summary>
         /// Creates a new <see cref="HttpHeadAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpOptionsAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpOptionsAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "OPTIONS" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "OPTIONS" };
 
         /// <summary>
         /// Creates a new <see cref="HttpOptionsAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpPatchAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpPatchAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "PATCH" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "PATCH" };
 
         /// <summary>
         /// Creates a new <see cref="HttpPatchAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpPostAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpPostAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "POST" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "POST" };
 
         /// <summary>
         /// Creates a new <see cref="HttpPostAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/HttpPutAttribute.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Mvc
     /// </summary>
     public class HttpPutAttribute : HttpMethodAttribute
     {
-        private static readonly IEnumerable<string> _supportedMethods = new string[] { "PUT" };
+        private static readonly IEnumerable<string> _supportedMethods = new [] { "PUT" };
 
         /// <summary>
         /// Creates a new <see cref="HttpPutAttribute"/>.

src/Microsoft.AspNetCore.Mvc.Core/Internal/AcceptHeaderParser.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using Microsoft.AspNetCore.Mvc.Core;
 
 namespace Microsoft.AspNetCore.Mvc.Formatters.Internal
 {
@@ -71,8 +70,7 @@ namespace Microsoft.AspNetCore.Mvc.Formatters.Internal
                 return true;
             }
 
-            var separatorFound = false;
-            var currentIndex = GetNextNonEmptyOrWhitespaceIndex(value, index, out separatorFound);
+            var currentIndex = GetNextNonEmptyOrWhitespaceIndex(value, index, out var separatorFound);
 
             if (currentIndex == value.Length)
             {

src/Microsoft.AspNetCore.Mvc.Core/Internal/AttributeRoute.cs

@@ -41,7 +41,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
             if (handlerFactory == null)
             {
-                _handlerFactory = handlerFactory;
+                throw new ArgumentNullException(nameof(handlerFactory));
             }
 
             _actionDescriptorCollectionProvider = actionDescriptorCollectionProvider;

src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionDescriptorBuilder.cs

@@ -173,7 +173,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                             .Where(constraint => !(constraint is IRouteTemplateProvider)).ToList();
                     }
 
-                    AddActionConstraints(actionDescriptor, action, actionSelectorModel, controllerConstraints);
+                    AddActionConstraints(actionDescriptor, actionSelectorModel, controllerConstraints);
                 }
                 else if (controllerAttributeRoutes.Count > 0)
                 {
@@ -195,7 +195,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                         // metadata from the 'other' attribute routes.
                         var controllerConstraints = controllerSelectorModel.ActionConstraints
                             .Where(c => c == controllerAttributeRoute?.Attribute || !(c is IRouteTemplateProvider));
-                        AddActionConstraints(actionDescriptor, action, actionSelectorModel, controllerConstraints);
+                        AddActionConstraints(actionDescriptor, actionSelectorModel, controllerConstraints);
                     }
                 }
                 else
@@ -216,7 +216,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                     // If there's no attribute route on the controller, then we use all of the filters/constraints
                     // on the controller regardless.
                     AddActionFilters(actionDescriptor, action.Filters, controller.Filters, application.Filters);
-                    AddActionConstraints(actionDescriptor, action, actionSelectorModel, controllerConstraints);
+                    AddActionConstraints(actionDescriptor, actionSelectorModel, controllerConstraints);
                 }
             }
 
@@ -378,7 +378,6 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
         private static void AddActionConstraints(
             ControllerActionDescriptor actionDescriptor,
-            ActionModel action,
             SelectorModel selectorModel,
             IEnumerable<IActionConstraintMetadata> controllerConstraints)
         {
@@ -673,8 +672,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                 ActionModel action,
                 IList<ControllerActionDescriptor> actionDescriptors)
             {
-                IDictionary<ActionModel, IList<ControllerActionDescriptor>> actionsForMethod = null;
-                if (TryGetValue(action.ActionMethod, out actionsForMethod))
+                if (TryGetValue(action.ActionMethod, out var actionsForMethod))
                 {
                     actionsForMethod.Add(action, actionDescriptors);
                 }

src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvoker.cs

@@ -54,9 +54,6 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
         private Task Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
         {
-            var diagnosticSource = _diagnosticSource;
-            var logger = _logger;
-
             switch (next)
             {
                 case State.ActionBegin:

src/Microsoft.AspNetCore.Mvc.Core/Internal/ControllerActionInvokerProvider.cs

@@ -44,7 +44,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                 throw new ArgumentNullException(nameof(context));
             }
 
-            if (context.ActionContext.ActionDescriptor is ControllerActionDescriptor actionDescriptor)
+            if (context.ActionContext.ActionDescriptor is ControllerActionDescriptor)
             {
                 var controllerContext = new ControllerContext(context.ActionContext);
                 // PERF: These are rarely going to be changed, so let's go copy-on-write.

src/Microsoft.AspNetCore.Mvc.Core/Internal/DefaultApplicationModelProvider.cs

@@ -118,7 +118,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             var currentTypeInfo = typeInfo;
             var objectTypeInfo = typeof(object).GetTypeInfo();
 
-            IRouteTemplateProvider[] routeAttributes = null;
+            IRouteTemplateProvider[] routeAttributes;
 
             do
             {
@@ -139,7 +139,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
             // CoreCLR returns IEnumerable<Attribute> from GetCustomAttributes - the OfType<object>
             // is needed to so that the result of ToArray() is object
-            var attributes = typeInfo.GetCustomAttributes(inherit: true).OfType<object>().ToArray();
+            var attributes = typeInfo.GetCustomAttributes(inherit: true);
 
             // This is fairly complicated so that we maintain referential equality between items in
             // ControllerModel.Attributes and ControllerModel.Attributes[*].Attribute.
@@ -220,7 +220,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
             // CoreCLR returns IEnumerable<Attribute> from GetCustomAttributes - the OfType<object>
             // is needed to so that the result of ToArray() is object
-            var attributes = propertyInfo.GetCustomAttributes(inherit: true).OfType<object>().ToArray();
+            var attributes = propertyInfo.GetCustomAttributes(inherit: true);
             var propertyModel = new PropertyModel(propertyInfo, attributes);
             var bindingInfo = BindingInfo.GetBindingInfo(attributes);
 
@@ -261,7 +261,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
             // CoreCLR returns IEnumerable<Attribute> from GetCustomAttributes - the OfType<object>
             // is needed to so that the result of ToArray() is object
-            var attributes = methodInfo.GetCustomAttributes(inherit: true).OfType<object>().ToArray();
+            var attributes = methodInfo.GetCustomAttributes(inherit: true);
 
             var actionModel = new ActionModel(methodInfo, attributes);
 
@@ -304,7 +304,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             // Then we want to 'filter' the set of attributes, so that only the effective routes apply.
             var currentMethodInfo = methodInfo;
 
-            IRouteTemplateProvider[] routeAttributes = null;
+            IRouteTemplateProvider[] routeAttributes;
 
             while (true)
             {
@@ -432,7 +432,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
             // CoreCLR returns IEnumerable<Attribute> from GetCustomAttributes - the OfType<object>
             // is needed to so that the result of ToArray() is object
-            var attributes = parameterInfo.GetCustomAttributes(inherit: true).OfType<object>().ToArray();
+            var attributes = parameterInfo.GetCustomAttributes(inherit: true);
             var parameterModel = new ParameterModel(parameterInfo, attributes);
 
             var bindingInfo = BindingInfo.GetBindingInfo(attributes);

src/Microsoft.AspNetCore.Mvc.Core/Internal/DefaultModelBindingContext.cs

@@ -20,13 +20,6 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding
         private State _state;
         private readonly Stack<State> _stack = new Stack<State>();
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="DefaultModelBindingContext"/> class.
-        /// </summary>
-        public DefaultModelBindingContext()
-        {
-        }
-
         /// <inheritdoc />
         public override ActionContext ActionContext
         {

src/Microsoft.AspNetCore.Mvc.Core/Internal/FileContentResultExecutor.cs

@@ -60,10 +60,8 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                 return Task.CompletedTask;
             }
 
-            var response = context.HttpContext.Response;
-            var outputStream = response.Body;
-            var fileContentsStream = new MemoryStream(result.FileContents);
-            return WriteFileAsync(context.HttpContext, fileContentsStream, range, rangeLength);
+            var fileContentStream = new MemoryStream(result.FileContents);
+            return WriteFileAsync(context.HttpContext, fileContentStream, range, rangeLength);
         }
     }
 }

src/Microsoft.AspNetCore.Mvc.Core/Internal/FileStreamResultExecutor.cs

@@ -65,8 +65,6 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                 return Task.CompletedTask;
             }
 
-            var response = context.HttpContext.Response;
-            var outputStream = response.Body;
             return WriteFileAsync(context.HttpContext, result.FileStream, range, rangeLength);
         }
     }

src/Microsoft.AspNetCore.Mvc.Core/Internal/HttpTokenParsingRules.cs

@@ -226,7 +226,7 @@ namespace Microsoft.AspNetCore.Mvc.Formatters.Internal
                         }
 
                         var nestedLength = 0;
-                        HttpParseResult nestedResult = GetExpressionLength(input, current, openChar, closeChar,
+                        var nestedResult = GetExpressionLength(input, current, openChar, closeChar,
                             supportsNesting, ref nestedCount, out nestedLength);
 
                         switch (nestedResult)

src/Microsoft.AspNetCore.Mvc.Core/Internal/LocalRedirectResultExecutor.cs

@@ -46,13 +46,12 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             var urlHelper = result.UrlHelper ?? _urlHelperFactory.GetUrlHelper(context);
 
             // IsLocalUrl is called to handle  Urls starting with '~/'.
-            var destinationUrl = result.Url;
             if (!urlHelper.IsLocalUrl(result.Url))
             {
                 throw new InvalidOperationException(Resources.UrlNotLocal);
             }
 
-            destinationUrl = urlHelper.Content(result.Url);
+            var destinationUrl = urlHelper.Content(result.Url);
             _logger.LocalRedirectResultExecuting(destinationUrl);
 
             if (result.PreserveMethod)

src/Microsoft.AspNetCore.Mvc.Core/Internal/MvcCoreBuilder.cs

@@ -2,9 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Mvc.ApplicationParts;
-using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.AspNetCore.Mvc.Internal

src/Microsoft.AspNetCore.Mvc.Core/Internal/ObjectResultExecutor.cs

@@ -193,7 +193,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
             }
 
             var request = formatterContext.HttpContext.Request;
-            var acceptableMediaTypes = GetAcceptableMediaTypes(contentTypes, request);
+            var acceptableMediaTypes = GetAcceptableMediaTypes(request);
             var selectFormatterWithoutRegardingAcceptHeader = false;
             IOutputFormatter selectedFormatter = null;
 
@@ -254,12 +254,11 @@ namespace Microsoft.AspNetCore.Mvc.Internal
         }
 
         private List<MediaTypeSegmentWithQuality> GetAcceptableMediaTypes(
-            MediaTypeCollection contentTypes,
             HttpRequest request)
         {
             var result = new List<MediaTypeSegmentWithQuality>();
             AcceptHeaderParser.ParseAcceptHeader(request.Headers[HeaderNames.Accept], result);
-            for (int i = 0; i < result.Count; i++)
+            for (var i = 0; i < result.Count; i++)
             {
                 var mediaType = new MediaType(result[i].MediaType);
                 if (!RespectBrowserAcceptHeader && mediaType.MatchesAllSubTypes && mediaType.MatchesAllTypes)

src/Microsoft.AspNetCore.Mvc.Core/Internal/ResourceInvoker.cs

@@ -159,9 +159,6 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
         private Task Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
         {
-            var diagnosticSource = _diagnosticSource;
-            var logger = _logger;
-
             switch (next)
             {
                 case State.InvokeBegin:
@@ -733,7 +730,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
                         var resultExecutingContext = _resultExecutingContext;
                         var resultExecutedContext = _resultExecutedContext;
 
-                        if (resultExecutedContext == null || resultExecutingContext.Cancel == true)
+                        if (resultExecutedContext == null || resultExecutingContext.Cancel)
                         {
                             // Short-circuited by not calling next || Short-circuited by setting Cancel == true
                             _logger.ResultFilterShortCircuited(filter);
@@ -766,7 +763,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
                         _diagnosticSource.AfterOnResultExecuting(resultExecutingContext, filter);
 
-                        if (_resultExecutingContext.Cancel == true)
+                        if (_resultExecutingContext.Cancel)
                         {
                             // Short-circuited by setting Cancel == true
                             _logger.ResultFilterShortCircuited(filter);
@@ -857,8 +854,6 @@ namespace Microsoft.AspNetCore.Mvc.Internal
 
                 case State.ResourceInsideEnd:
                     {
-                        var result = _result;
-
                         if (scope == Scope.Resource)
                         {
                             _resourceExecutedContext = new ResourceExecutedContext(_actionContext, _filters)
@@ -991,7 +986,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
         private async Task<ResultExecutedContext> InvokeNextResultFilterAwaitedAsync()
         {
             Debug.Assert(_resultExecutingContext != null);
-            if (_resultExecutingContext.Cancel == true)
+            if (_resultExecutingContext.Cancel)
             {
                 // If we get here, it means that an async filter set cancel == true AND called next().
                 // This is forbidden.

src/Microsoft.AspNetCore.Mvc.Core/Internal/ResponseCacheFilter.cs

@@ -15,7 +15,7 @@ namespace Microsoft.AspNetCore.Mvc.Internal
     /// <summary>
     /// An <see cref="IActionFilter"/> which sets the appropriate headers related to response caching.
     /// </summary>
-    public class ResponseCacheFilter : IActionFilter, IResponseCacheFilter
+    public class ResponseCacheFilter : IResponseCacheFilter
     {
         private readonly CacheProfile _cacheProfile;
         private int? _cacheDuration;

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/ArrayModelBinder.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using Microsoft.AspNetCore.Mvc.Internal;
 
 namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
 {

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/BodyModelBinder.cs

@@ -150,7 +150,6 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
 
             try
             {
-                var previousCount = bindingContext.ModelState.ErrorCount;
                 var result = await formatter.ReadAsync(formatterContext);
                 var model = result.Model;
 
@@ -177,13 +176,10 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
                         .MissingRequestBodyRequiredValueAccessor();
                     bindingContext.ModelState.AddModelError(modelBindingKey, message);
                 }
-
-                return;
             }
             catch (Exception ex)
             {
                 bindingContext.ModelState.AddModelError(modelBindingKey, ex, bindingContext.ModelMetadata);
-                return;
             }
         }
     }

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/CollectionModelBinder.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
@@ -182,7 +181,7 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
                     bindingContext.ValueProvider
                 };
 
-                object boundValue = null;
+                object boundValue;
 
                 using (bindingContext.EnterNestedScope(
                     elementMetadata,
@@ -355,32 +354,6 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
             }
         }
 
-        private static object[] RawValueToObjectArray(object rawValue)
-        {
-            // precondition: rawValue is not null
-
-            // Need to special-case String so it's not caught by the IEnumerable check which follows
-            if (rawValue is string)
-            {
-                return new[] { rawValue };
-            }
-
-            var rawValueAsObjectArray = rawValue as object[];
-            if (rawValueAsObjectArray != null)
-            {
-                return rawValueAsObjectArray;
-            }
-
-            var rawValueAsEnumerable = rawValue as IEnumerable;
-            if (rawValueAsEnumerable != null)
-            {
-                return rawValueAsEnumerable.Cast<object>().ToArray();
-            }
-
-            // fallback
-            return new[] { rawValue };
-        }
-
         private static IEnumerable<string> GetIndexNamesFromValueProviderResult(ValueProviderResult valueProviderResult)
         {
             IEnumerable<string> indexNames = null;

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/ComplexTypeModelBinder.cs

@@ -400,15 +400,14 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
             }
             catch (Exception exception)
             {
-                AddModelError(exception, modelName, bindingContext, result);
+                AddModelError(exception, modelName, bindingContext);
             }
         }
 
         private static void AddModelError(
             Exception exception,
             string modelName,
-            ModelBindingContext bindingContext,
-            ModelBindingResult result)
+            ModelBindingContext bindingContext)
         {
             var targetInvocationException = exception as TargetInvocationException;
             if (targetInvocationException != null && targetInvocationException.InnerException != null)

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/ComplexTypeModelBinderProvider.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Reflection;
 
 namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
 {

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/FormCollectionModelBinder.cs

@@ -78,21 +78,11 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Binders
                 return false;
             }
 
-            public string Get(string key)
-            {
-                return null;
-            }
-
             public IEnumerator<KeyValuePair<string, StringValues>> GetEnumerator()
             {
                 return Enumerable.Empty<KeyValuePair<string, StringValues>>().GetEnumerator();
             }
 
-            public IList<StringValues> GetValues(string key)
-            {
-                return null;
-            }
-
             public bool TryGetValue(string key, out StringValues value)
             {
                 value = default(StringValues);

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/CompositeValueProvider.cs

@@ -21,7 +21,6 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding
         /// Initializes a new instance of <see cref="CompositeValueProvider"/>.
         /// </summary>
         public CompositeValueProvider()
-            : base()
         {
         }
 

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Internal/ModelBindingHelper.cs

@@ -275,7 +275,7 @@ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Internal
                 valueProvider,
                 modelMetadata,
                 bindingInfo: null,
-                modelName: prefix ?? string.Empty);
+                modelName: prefix);
 
             modelBindingContext.Model = model;
             modelBindingContext.PropertyFilter = propertyFilter;

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Metadata/BindingSourceMetadataProvider.cs

@@ -2,8 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Reflection;
-using System.Threading;
 
 namespace Microsoft.AspNetCore.Mvc.ModelBinding.Metadata
 {

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Metadata/ExcludeBindingMetadataProvider.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Reflection;
 
 namespace Microsoft.AspNetCore.Mvc.ModelBinding.Metadata
 {

src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/UnsupportedContentTypeException.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNetCore.Mvc.Formatters;
 
 namespace Microsoft.AspNetCore.Mvc.ModelBinding
 {

src/Microsoft.AspNetCore.Mvc.Core/Routing/IRouteValueProvider.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Routing;
-using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.AspNetCore.Mvc.Controllers;
 
 namespace Microsoft.AspNetCore.Mvc.Routing

src/Microsoft.AspNetCore.Mvc.Core/VirtualFileResult.cs

@@ -2,9 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.IO;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.FileProviders;

src/Microsoft.AspNetCore.Mvc.Cors/DependencyInjection/MvcCorsMvcCoreBuilderExtensions.cs

@@ -38,12 +38,8 @@ namespace Microsoft.Extensions.DependencyInjection
             }
 
             AddCorsServices(builder.Services);
-
-            if (setupAction != null)
-            {
-                builder.Services.Configure(setupAction);
-            }
-
+            builder.Services.Configure(setupAction);
+            
             return builder;
         }
 

src/Microsoft.AspNetCore.Mvc.Cors/Internal/DisableCorsAuthorizationFilter.cs

@@ -6,7 +6,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Cors.Infrastructure;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Filters;
-using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.AspNetCore.Mvc.Cors.Internal

src/Microsoft.AspNetCore.Mvc.DataAnnotations/DependencyInjection/MvcDataAnnotationsMvcCoreBuilderExtensions.cs

@@ -5,8 +5,6 @@ using System;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.DataAnnotations;
 using Microsoft.AspNetCore.Mvc.DataAnnotations.Internal;
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Options;
 

src/Microsoft.AspNetCore.Mvc.DataAnnotations/Internal/NumericClientModelValidator.cs

@@ -26,15 +26,12 @@ namespace Microsoft.AspNetCore.Mvc.DataAnnotations.Internal
             MergeAttribute(context.Attributes, "data-val-number", GetErrorMessage(context.ModelMetadata));
         }
 
-        private static bool MergeAttribute(IDictionary<string, string> attributes, string key, string value)
+        private static void MergeAttribute(IDictionary<string, string> attributes, string key, string value)
         {
-            if (attributes.ContainsKey(key))
+            if (!attributes.ContainsKey(key))
             {
-                return false;
+                attributes.Add(key, value);
             }
-
-            attributes.Add(key, value);
-            return true;
         }
 
         private string GetErrorMessage(ModelMetadata modelMetadata)

src/Microsoft.AspNetCore.Mvc.Formatters.Json/DependencyInjection/MvcJsonMvcCoreBuilderExtensions.cs

@@ -66,7 +66,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 throw new ArgumentNullException(nameof(setupAction));
             }
 
-            builder.Services.Configure<MvcJsonOptions>(setupAction);
+            builder.Services.Configure(setupAction);
             return builder;
         }
 

src/Microsoft.AspNetCore.Mvc.Formatters.Json/Internal/JsonResultExecutor.cs

@@ -99,8 +99,8 @@ namespace Microsoft.AspNetCore.Mvc.Formatters.Json.Internal
 
             var response = context.HttpContext.Response;
 
-            string resolvedContentType = null;
-            Encoding resolvedContentTypeEncoding = null;
+            string resolvedContentType;
+            Encoding resolvedContentTypeEncoding;
             ResponseContentTypeHelper.ResolveContentTypeAndEncoding(
                 result.ContentType,
                 response.ContentType,

src/Microsoft.AspNetCore.Mvc.Formatters.Json/JsonInputFormatter.cs

@@ -153,8 +153,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
                     {
                         successful = false;
 
-                        var exception = eventArgs.ErrorContext.Error;
-
                         // Handle path combinations such as "" + "Property", "Parent" + "Property", or "Parent" + "[12]".
                         var key = eventArgs.ErrorContext.Path;
                         if (!string.IsNullOrEmpty(context.ModelName))

src/Microsoft.AspNetCore.Mvc.Formatters.Xml/EnumerableWrapperProvider.cs

@@ -70,7 +70,7 @@ namespace Microsoft.AspNetCore.Mvc.Formatters.Xml
                 return null;
             }
 
-            return _wrappingTypeConstructor.Invoke(new object[] { original, _wrapperProvider });
+            return _wrappingTypeConstructor.Invoke(new[] { original, _wrapperProvider });
         }
     }
 }

src/Microsoft.AspNetCore.Mvc.Formatters.Xml/XmlSerializerOutputFormatter.cs

@@ -166,8 +166,6 @@ namespace Microsoft.AspNetCore.Mvc.Formatters
                 throw new ArgumentNullException(nameof(selectedEncoding));
             }
 
-            var response = context.HttpContext.Response;
-
             var writerSettings = WriterSettings.Clone();
             writerSettings.Encoding = selectedEncoding;
 

src/Microsoft.AspNetCore.Mvc.Localization/LocalizedHtmlString.cs

@@ -5,7 +5,6 @@ using System;
 using System.IO;
 using System.Text.Encodings.Web;
 using Microsoft.AspNetCore.Html;
-using Microsoft.AspNetCore.Mvc.Internal;
 
 namespace Microsoft.AspNetCore.Mvc.Localization
 {
@@ -22,7 +21,7 @@ namespace Microsoft.AspNetCore.Mvc.Localization
         /// <param name="name">The name of the string resource.</param>
         /// <param name="value">The string resource.</param>
         public LocalizedHtmlString(string name, string value)
-            : this(name, value, isResourceNotFound: false, arguments: Array.Empty<string>())
+            : this(name, value, isResourceNotFound: false, arguments: Array.Empty<object>())
         {
         }
 
@@ -33,7 +32,7 @@ namespace Microsoft.AspNetCore.Mvc.Localization
         /// <param name="value">The string resource.</param>
         /// <param name="isResourceNotFound">A flag that indicates if the resource is not found.</param>
         public LocalizedHtmlString(string name, string value, bool isResourceNotFound)
-            : this(name, value, isResourceNotFound, arguments: Array.Empty<string>())
+            : this(name, value, isResourceNotFound, arguments: Array.Empty<object>())
         {
         }
 

src/Microsoft.AspNetCore.Mvc.Razor/DependencyInjection/MvcRazorMvcCoreBuilderExtensions.cs

@@ -52,10 +52,7 @@ namespace Microsoft.Extensions.DependencyInjection
             AddRazorViewEngineFeatureProviders(builder);
             AddRazorViewEngineServices(builder.Services);
 
-            if (setupAction != null)
-            {
-                builder.Services.Configure(setupAction);
-            }
+            builder.Services.Configure(setupAction);
 
             return builder;
         }
@@ -164,7 +161,7 @@ namespace Microsoft.Extensions.DependencyInjection
             services.TryAddSingleton<RazorTemplateEngine, MvcRazorTemplateEngine>();
             services.TryAddSingleton<LazyMetadataReferenceFeature>();
 
-            services.TryAddSingleton<RazorEngine>(s =>
+            services.TryAddSingleton(s =>
             {
                 return RazorEngine.Create(b =>
                 {

src/Microsoft.AspNetCore.Mvc.Razor/Internal/CompilationFailedExceptionFactory.cs

@@ -97,7 +97,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
 
         private static string ReadContent(RazorCodeDocument codeDocument, string filePath)
         {
-            RazorSourceDocument sourceDocument = null;
+            RazorSourceDocument sourceDocument;
             if (string.IsNullOrEmpty(filePath) || string.Equals(codeDocument.Source.FileName, filePath, StringComparison.Ordinal))
             {
                 sourceDocument = codeDocument.Source;

src/Microsoft.AspNetCore.Mvc.Razor/Internal/ExpressionRewriter.cs

@@ -149,9 +149,6 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
             SimpleLambdaExpressionSyntax node,
             IdentifierNameSyntax memberAccess)
         {
-            // We want to make the new span
-            var originalSpan = node.GetLocation().GetMappedLineSpan();
-
             var charactersToExclude = memberAccess.Identifier.Text.Length;
             var triviaList = new SyntaxTriviaList();
 

src/Microsoft.AspNetCore.Mvc.Razor/Internal/RazorViewCompiler.cs

@@ -24,7 +24,6 @@ namespace Microsoft.AspNetCore.Mvc.Razor.Internal
     /// </summary>
     public class RazorViewCompiler : IViewCompiler
     {
-        private readonly object _initializeLock = new object();
         private readonly object _cacheLock = new object();
         private readonly Dictionary<string, Task<CompiledViewDescriptor>> _precompiledViewLookup;
         private readonly ConcurrentDictionary<string, string> _normalizedPathLookup;

src/Microsoft.AspNetCore.Mvc.Razor/LanguageViewLocationExpander.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Threading;
 
 namespace Microsoft.AspNetCore.Mvc.Razor
 {

src/Microsoft.AspNetCore.Mvc.Razor/RazorPage.cs

@@ -3,13 +3,10 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc.Rendering;
-using Microsoft.AspNetCore.Mvc.ViewFeatures;
 
 namespace Microsoft.AspNetCore.Mvc.Razor
 {
@@ -23,13 +20,6 @@ namespace Microsoft.AspNetCore.Mvc.Razor
         private bool _ignoreBody;
         private HashSet<string> _ignoredSections;
 
-        /// <summary>
-        /// Initializes a new instance of <see cref="RazorPage"/>.
-        /// </summary>
-        public RazorPage()
-        {
-        }
-
         /// <summary>
         /// An <see cref="HttpContext"/> representing the current request execution.
         /// </summary>
@@ -284,10 +274,6 @@ namespace Microsoft.AspNetCore.Mvc.Razor
             }
         }
 
-        // Working around an issue with ApiCheck tool
-        /// <inheritdoc />
-        public override Task<HtmlString> FlushAsync() => base.FlushAsync();
-
         public override void BeginContext(int position, int length, bool isLiteral)
         {
             const string BeginContextEvent = "Microsoft.AspNetCore.Mvc.Razor.BeginInstrumentationContext";

src/Microsoft.AspNetCore.Mvc.Razor/RazorPageOfT.cs

@@ -1,14 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-using System.Linq.Expressions;
-using Microsoft.AspNetCore.Mvc.ModelBinding;
 using Microsoft.AspNetCore.Mvc.Razor.Internal;
-using Microsoft.AspNetCore.Mvc.Rendering;
 using Microsoft.AspNetCore.Mvc.ViewFeatures;
-using Microsoft.AspNetCore.Mvc.ViewFeatures.Internal;
-using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.AspNetCore.Mvc.Razor
 {

src/Microsoft.AspNetCore.Mvc.Razor/RazorView.cs

@@ -273,7 +273,6 @@ namespace Microsoft.AspNetCore.Mvc.Razor
                 {
                     // This means we're writing to another buffer. Use MoveTo to combine them.
                     bodyWriter.Buffer.MoveTo(viewBufferTextWriter.Buffer);
-                    return;
                 }
             }
         }

src/Microsoft.AspNetCore.Mvc.Razor/RazorViewEngine.cs

@@ -221,7 +221,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor
                     cacheResult = new ViewLocationCacheResult(new[] { applicationRelativePath });
                 }
 
-                cacheResult = ViewLookupCache.Set<ViewLocationCacheResult>(
+                cacheResult = ViewLookupCache.Set(
                     cacheKey,
                     cacheResult,
                     cacheEntryOptions);
@@ -384,7 +384,7 @@ namespace Microsoft.AspNetCore.Mvc.Razor
                 cacheEntryOptions.AddExpirationToken(expirationToken);
             }
 
-            return ViewLookupCache.Set<ViewLocationCacheResult>(cacheKey, cacheResult, cacheEntryOptions);
+            return ViewLookupCache.Set(cacheKey, cacheResult, cacheEntryOptions);
         }
 
         // Internal for unit testing

src/Microsoft.AspNetCore.Mvc.Razor/TagHelpers/TagHelperFeatureProvider.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
-using System.Linq;
 using System.Reflection;
 using Microsoft.AspNetCore.Mvc.ApplicationParts;
 using Microsoft.AspNetCore.Razor.TagHelpers;

src/Microsoft.AspNetCore.Mvc.RazorPages/DependencyInjection/MvcRazorPagesMvcCoreBuilderExtensions.cs

@@ -2,10 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Linq;
 using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.AspNetCore.Mvc.ApplicationModels;
-using Microsoft.AspNetCore.Mvc.ApplicationParts;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.AspNetCore.Mvc.Razor;
 using Microsoft.AspNetCore.Mvc.RazorPages;

src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/DefaultPageModelActivatorProvider.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Reflection;
-using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure

src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/PageResultExecutor.cs

@@ -3,12 +3,10 @@
 
 using System;
 using System.Diagnostics;
-using System.Linq;
 using System.Text.Encodings.Web;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.AspNetCore.Mvc.Razor;
-using Microsoft.AspNetCore.Mvc.RazorPages.Internal;
 using Microsoft.AspNetCore.Mvc.ViewEngines;
 using Microsoft.AspNetCore.Mvc.ViewFeatures;
 

src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/RazorPageAdapter.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Mvc.Razor;

src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/ExecutorFactory.cs

@@ -30,10 +30,7 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Internal
             var method = handlerDescriptor.MethodInfo;
             var parameters = handlerDescriptor.Parameters.ToArray();
 
-            var methodParameters = method.GetParameters();
-
             var returnType = method.ReturnType;
-            var returnTypeInfo = method.ReturnType.GetTypeInfo();
             if (returnType == typeof(void))
             {
                 return new VoidHandlerMethod(parameters, method);

src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/MvcRazorPagesDiagnosticSourceExtensions.cs

@@ -4,7 +4,6 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using Microsoft.AspNetCore.Mvc.Filters;
-using Microsoft.AspNetCore.Mvc.RazorPages;
 using Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;
 
 namespace Microsoft.AspNetCore.Mvc.Internal

src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/PageActionInvokerProvider.cs

@@ -6,7 +6,6 @@ using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.AspNetCore.Mvc.Filters;
@@ -227,21 +226,6 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Internal
             return viewStartFactories;
         }
 
-        private static object GetDefaultValue(ParameterInfo methodParameter)
-        {
-            object defaultValue = null;
-            if (methodParameter.HasDefaultValue)
-            {
-                defaultValue = methodParameter.DefaultValue;
-            }
-            else if (methodParameter.ParameterType.GetTypeInfo().IsValueType)
-            {
-                defaultValue = Activator.CreateInstance(methodParameter.ParameterType);
-            }
-
-            return defaultValue;
-        }
-
         private static Func<object, object[], Task<IActionResult>>[] GetExecutors(CompiledPageActionDescriptor actionDescriptor)
         {
             if (actionDescriptor.HandlerMethods == null || actionDescriptor.HandlerMethods.Count == 0)

src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/PageLoggerExtensions.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Diagnostics;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
 using Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;
@@ -12,7 +11,6 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Internal
 {
     internal static class PageLoggerExtensions
     {
-        private static readonly double TimestampToTicks = TimeSpan.TicksPerSecond / (double)Stopwatch.Frequency;
         private static readonly Action<ILogger, string, string[], ModelValidationState, Exception> _handlerMethodExecuting;
         private static readonly Action<ILogger, string, string, Exception> _handlerMethodExecuted;
         private static readonly Action<ILogger, object, Exception> _pageFilterShortCircuit;

src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/PagePropertyBinderFactory.cs

@@ -34,8 +34,6 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Internal
                 return null;
             }
 
-            var isHandlerThePage = actionDescriptor.HandlerTypeInfo == actionDescriptor.PageTypeInfo;
-            
             var type = actionDescriptor.HandlerTypeInfo.AsType();
             var metadata = new ModelMetadata[properties.Count];
             for (var i = 0; i < properties.Count; i++)

src/Microsoft.AspNetCore.Mvc.RazorPages/Page.cs

@@ -1,24 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-using System.Diagnostics;
-using System.IO;
-using System.Linq.Expressions;
-using System.Security.Claims;
-using System.Text;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Authentication;
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using Microsoft.AspNetCore.Mvc.ModelBinding.Internal;
-using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
-using Microsoft.AspNetCore.Mvc.Razor;
 using Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;
-using Microsoft.AspNetCore.Mvc.Rendering;
-using Microsoft.AspNetCore.Routing;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNetCore.Mvc.RazorPages
 {

src/Microsoft.AspNetCore.Mvc.TagHelpers/Cache/DistributedCacheTagHelperService.cs

@@ -9,7 +9,6 @@ using System.Text;
 using System.Text.Encodings.Web;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
-using Microsoft.AspNetCore.Mvc.Rendering;
 using Microsoft.AspNetCore.Mvc.TagHelpers.Internal;
 using Microsoft.AspNetCore.Razor.TagHelpers;
 using Microsoft.Extensions.Caching.Distributed;
@@ -81,7 +80,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers.Cache
 
             while (content == null)
             {
-                Task<IHtmlContent> result = null;
+                Task<IHtmlContent> result;
 
                 // Is there any request already processing the value?
                 if (!_workers.TryGetValue(key, out result))

src/Microsoft.AspNetCore.Mvc.TagHelpers/CacheTagHelper.cs

@@ -73,7 +73,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
 
                 while (content == null)
                 {
-                    Task<IHtmlContent> result = null;
+                    Task<IHtmlContent> result;
 
                     if (!MemoryCache.TryGetValue(cacheKey, out result))
                     {

src/Microsoft.AspNetCore.Mvc.TagHelpers/CacheTagHelperBase.cs

@@ -23,9 +23,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
         private const string ExpiresOnAttributeName = "expires-on";
         private const string ExpiresAfterAttributeName = "expires-after";
         private const string ExpiresSlidingAttributeName = "expires-sliding";
-        private const string CacheKeyTokenSeparator = "||";
         private const string EnabledAttributeName = "enabled";
-        private static readonly char[] AttributeSeparator = new[] { ',' };
 
         /// <summary>
         /// Creates a new <see cref="CacheTagHelperBase"/>.

src/Microsoft.AspNetCore.Mvc.TagHelpers/DistributedCacheTagHelper.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Text.Encodings.Web;
-using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Mvc.TagHelpers.Cache;
@@ -65,12 +64,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
                 throw new ArgumentNullException(nameof(output));
             }
 
-            IHtmlContent content = null;
-
-            // Create a cancellation token that will be used
-            // to release the task from the memory cache.
-            var tokenSource = new CancellationTokenSource();
-
+            IHtmlContent content;
             if (Enabled)
             {
                 var cacheKey = new CacheTagKey(this);

src/Microsoft.AspNetCore.Mvc.TagHelpers/EnvironmentTagHelper.cs

@@ -150,7 +150,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
                 // This instance had at least one non-empty environment (names or include) specified but none of these
                 // environments matched the current environment. Suppress the output in this case.
                 output.SuppressOutput();
-                return;
             }
         }
     }

src/Microsoft.AspNetCore.Mvc.TagHelpers/ImageTagHelper.cs

@@ -5,10 +5,8 @@ using System;
 using System.Text.Encodings.Web;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Mvc.Razor.TagHelpers;
-using Microsoft.AspNetCore.Mvc.Rendering;
 using Microsoft.AspNetCore.Mvc.Routing;
 using Microsoft.AspNetCore.Mvc.TagHelpers.Internal;
-using Microsoft.AspNetCore.Mvc.ViewFeatures;
 using Microsoft.AspNetCore.Razor.TagHelpers;
 using Microsoft.Extensions.Caching.Memory;
 
@@ -26,8 +24,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
         TagStructure = TagStructure.WithoutEndTag)]
     public class ImageTagHelper : UrlResolutionTagHelper
     {
-        private static readonly string Namespace = typeof(ImageTagHelper).Namespace;
-
         private const string AppendVersionAttributeName = "asp-append-version";
         private const string SrcAttributeName = "src";
 

src/Microsoft.AspNetCore.Mvc.TagHelpers/Internal/FileVersionProvider.cs

@@ -102,7 +102,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers.Internal
                     value = path;
                 }
 
-                value = _cache.Set<string>(path, value, cacheEntryOptions);
+                value = _cache.Set(path, value, cacheEntryOptions);
             }
 
             return value;

src/Microsoft.AspNetCore.Mvc.TagHelpers/Internal/GlobbingUrlBuilder.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc.Internal;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.FileProviders;
 using Microsoft.Extensions.FileSystemGlobbing;
@@ -149,7 +148,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers.Internal
                 matcher.AddExcludePatterns(trimmedExcludePatterns);
             }
 
-            return Cache.Set<List<string>>(
+            return Cache.Set(
                 cacheKey,
                 FindFiles(matcher),
                 options);

src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs

@@ -9,7 +9,6 @@ using System.Text.Encodings.Web;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Mvc.Razor.TagHelpers;
-using Microsoft.AspNetCore.Mvc.Rendering;
 using Microsoft.AspNetCore.Mvc.Routing;
 using Microsoft.AspNetCore.Mvc.TagHelpers.Internal;
 using Microsoft.AspNetCore.Razor.TagHelpers;

src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs

@@ -4,13 +4,10 @@
 using System;
 using System.Diagnostics;
 using System.IO;
-using System.Text;
 using System.Text.Encodings.Web;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Html;
-using Microsoft.AspNetCore.Mvc.Razor;
 using Microsoft.AspNetCore.Mvc.Razor.TagHelpers;
-using Microsoft.AspNetCore.Mvc.Rendering;
 using Microsoft.AspNetCore.Mvc.Routing;
 using Microsoft.AspNetCore.Mvc.TagHelpers.Internal;
 using Microsoft.AspNetCore.Razor.TagHelpers;